Information Society

1
Introduction
2
Information Society

• Our Civilisation, Culture
• Social order, Safety, Security
• Business, Wealth, etc.
• based on accessing using information
• gathering,
• processing,
• disseminating

3
Information Format

• Texts
• Pictures
• Sounds
• Data

• All translated into digital format
• Less expensive
• More practical

4
Access to Information a Key Problem of Humanity

• Report Of The UN Secretary General, 2000
• World Summit on Information Society (WSIS) 2003,
  2005
• Multitude of conferences, programs, action plans

http//www.un.org/millennium/sg/report/full.htm ww
w.itu.int/wsis
5
Digital Divide

• There is a large disparity as concerns the access
  to information, within each country and among
  countries.
• This Digital Divide creates new problems
• Political,
• Regulatory,
• Financial,
• Organizational,
• Technical
• that require new solutions
• Everybody who understands the problem should
  contribute as much as he/she can to bridging that
  gap

6
Hope in Radio Access

• Use of radio to access world-wide web potentially
  offers enormous benefits
• in low-density population areas (no satisfactory
  telecom infrastructure)
• in developing countries (no satisfactory telecom
  infrastructure)
• in solving the last-mile problem (highest cost,
  least bandwidth)
• in solving the access problem for nomadic users
• Radio for Mobile and Fixed applications
• point-to-point
• point-to-multipoint
• cellular technologies

7
Radio Wavescarry information 300000 km/s to
fixed mobile users
Transmission medium
Transmitting station
Receiving station
8
Wireless Or Cable?
TC
RC

• Wireless technologies use electromagnetic waves
  (radio, infrared, laser, visible light (and
  acoustic energy)) in place of wires/cables.
• Reasons (for other than nomadic/ mobile uses)
• Deployment time
• Cost factor
• Investment cost
• TC RC Cables Auxiliary equipment
  Deployment cost
• TR RR Antennas Auxiliary equipment
  Deployment cost
• Maintenance/ operation costs during the life-span
  of the system
• Compared with total benefits over the whole
  life-span of the system

9
Cellular communication concept
PSTN Interconnection
Cell

• Access to base station
• Interconnection to global public network
• Common standard

10
IMT-2000 Cells Macro to Pico
Global
Satellite
Suburban
Urban
In-Building
Picocell
Microcell
Macrocell
11
Aim of the Lectures

• We shall review basic topics related to radio
  links and only touch on more advanced issues. (To
  cover any of the many topics in detail, one would
  need much more time.)
• Beware of misprints! These are just my rough
  notes for lectures!